The brilliantly colored, clear material is perfect for light tables or any white surface! Arrange the Challenge Cards in the tray’s pocket. Arrange the circle wedges in the tray to solve the challenge. Layer the wedges to create more colors. Fun for a wide range of ages. Check out our instructional video for instructions. Each set includes: 1 Tray, 8" x 15-1/2" (20 x 39 cm), 24 circle wedges and 24 challenge cards, 3-1/2" x 3-1/2" (9 cm).